generalizing jones matrix for Nfeeds=1,2

[slosar]

Changes the jones matrix routine to (Nfeeds,2) instead of (2,2) generalizing to any Nfeeds. Down the line Nfeeds can still be only 1 or 2, but this can be changed. This is only a proposal.

Description

See file changes - pretty obvious. Still specialized for theta-phi coordinate system.

NEEDS TESTS!

[codecov]

Codecov Report

Attention: Patch coverage is 90.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 99.95%. Comparing base (c93c507) to head (b8863ac).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/pyuvsim/uvsim.py	83.33%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##              main     #394      +/-   ##
===========================================
- Coverage   100.00%   99.95%   -0.05%     
===========================================
  Files           10       10              
  Lines         2025     2029       +4     
===========================================
+ Hits          2025     2028       +3     
- Misses           0        1       +1     

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